Answer:
4
Step-by-step explanation:
You need to try out all the numbers.
lets start with 4
if there where 4 red marbles then there would be 9 times as many marbles
so 4 x 9 = 36
Now we add and see if the sum is 40
36 + 4 = 40
We got it on the first try
You can use the same method on more problems like these.
Hope this helps :)
Answer:
8
Step-by-step explanation:
the unknown can NEVER be negative
so you wont see an answer like
-b= 7, -a=98; -k= -9
so,
-x= -8 (change their positions so that the unknown, x, is positive)
x=8
Answer:
w = 10 cm
Step-by-step explanation:
The area of the triangle is 24 sq. cm.
24 * 5 = 105
120/12 = 10
Answer:
a= 5
b=7
c=0
Step-by-step explanation:
i cant explain it but here yu go
